Mid/Senior Software Engineer

Jack & Jill/External ATS; Greater London; On-site; GBP 60,000 - 80,000; Full time

Job summary

A well-funded fintech startup in London is seeking a Mid/Senior Software Engineer. In this role, you will join an agile team to build intelligent tools for investors. Your responsibilities include end-to-end feature development across a React and Node stack and the opportunity to influence platform architecture. Ideal candidates should have over 5 years of experience in web development focusing on React and TypeScript, with a strong curiosity for AI automation.

Benefits

Flexible work environment

Participation in equity options

Qualifications

• 5+ years of professional experience building production web applications.
• Ability to own features end-to-end, from data modeling to user experiences.
• Curiosity for AI automation and experience with code-assist tools.

Responsibilities

• Build and scale core product features using React, TypeScript, Node, and AWS.
• Collaborate with founders to define product direction and navigate trade-offs.
• Design AI-driven systems to automate financial workflows and reporting.

Skills

React

TypeScript

Node

AWS

SQL (Postgres)

AI automation

Job description

This is a job that Jill, our AI Recruiter, is recruiting for on behalf of one of our customers.

She will pick the best candidates from Jack's network.

The next step is to speak to Jack.

Mid/Senior Software Engineer

Company Description

VC-backed fintech SaaS

Job Description

You will join an agile team building intelligent tools for private equity and debt investors. You'll own end-to-end feature development across a React and Node stack, replacing manual workflows with automated systems. This role offers significant ownership in shaping the architecture of a platform already trusted by funds managing billions in capital.

Location

London, UK

Why this role is remarkable

• Ship high-impact features from 0→1, including AI agents and event-driven automation for global investment funds.
• Join a well-funded startup backed by top-tier VCs at a stage where you can influence the core architecture.
• Work in an elite, high-energy environment that prioritizes speed, product‑minded engineering, and collaborative in‑person problem‑solving.

What you will do

• Build and scale core product features across the full stack using React, TypeScript, Node, and AWS infrastructure.
• Collaborate directly with founders to define product direction and navigate complex technical trade‑offs.
• Design and implement multi‑tenant AI‑driven systems to automate sophisticated financial workflows and reporting.

The ideal candidate

• Professional experience building production web applications with 5+ years in React and TypeScript ecosystems.
• Proven ability to own features end-to-end, from data modeling in Postgres to polishing front‑end user experiences.
• High curiosity for AI automation and experience utilizing modern code‑assist tools like Cursor or Copilot to accelerate development.

Who are Jack & Jill?

Ok, I'll go first. I'm Jack, an AI that gets to know you on a quick call, learning what you're great at and what want from your career. Then I help you land your dream job by finding unmissable opportunities as they come up, supporting you with applications, interview prep, and moral support.

And I'm Jill, an AI Recruiter who talks to companies to understand who they're looking to hire. Then I recruit from Jack's network, making an introduction when I spot an excellent candidate.

Next steps

• Step 1. Visit our website.
• Step 2. Click 'Talk to Jack'.
• Step 3. Talk to Jack so he can understand your experience and ambitions.
• Step 4. Jack will make sure Jill considers you for this role.
• Step 5. If Jill thinks you're a great fit and her client wants to meet you, they will make the introduction.
• Step 6. If not, Jack will find you excellent alternatives. All for free.

We never post fake jobs

This isn't a trick. This is an open role that Jill is currently recruiting for from Jack's network. Sometimes Jill's clients ask her to anonymize their jobs when she advertises them, which means she can't share all the details in the job description. We appreciate this can make them look a bit suspect, but there isn't much we can do about it.

Give Jack a spin! You could land this role. If not, most people find him incredibly helpful with their job search, and we're giving his services away for free.